Authors

S. Toroghi;P. G. Kik

Comments

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Abbreviated Journal Title

Phys. Rev. B

Keywords

METAL NANOPARTICLE ARRAYS; OPTICAL-PROPERTIES; DIELECTRIC-CONSTANT; GOLD; NANOPARTICLES; PARTICLES; COMPOSITE; RESONANCES; FILMS; SUSCEPTIBILITY; GENERATION; Physics, Condensed Matter

Abstract

The nonlinear optical properties of plasmon resonant metamaterials consisting of chains of metal nanoparticles are evaluated. Introducing particle size differences along the chains leads to the development of cascaded plasmon resonances exhibiting increased field enhancement and field confinement. The interplay among the different resonances on the structures induces a frequency-dependent enhancement of the nonlinear refractive and absorptive response of the metamaterial, ultimately providing larger nonlinear susceptibility enhancement factors with engineered complex phase. It is shown that cascaded structures can provide a figure of merit for nonlinear absorption that is more than an order of magnitude larger than that obtained in noncascaded structures. The presented approach could lead to new planar and integrated nonlinear optical modulation and switching media with improved performance compared to their noncascaded counterparts.

Journal Title

Physical Review B

Volume

85

Issue/Number

4

Publication Date

1-1-2012

Document Type

Article

Language

English

First Page

7

WOS Identifier

WOS:000299290500007

ISSN

1098-0121

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